Damper slide for hot blast slide dampers

ABSTRACT

A slide for hot blast slide dampers having a pair of spiral volutes arranged in the shape of a flat disc having an inlet connection and an outlet connection for a coolant at the edge thereof. One of the spiral volutes leads the coolant from the inlet connection to the center of the disc and into the other spiral volute whereby the coolant is lead from the center of the disc to the outlet connection. The volutes are separated from each other by walls extending transverse to the major plane of the disc to form a cooling channel. The volutes are separated by a single common wall extending substantially perpendicular to the major plane of the disc and the cross section of the cooling channel may be substantially quadrangular. The volutes are made from spirally interwound open sections welded together.

Uerlichs et a DAMPERS Assignee:

Filed:

DAMPER SLIDE FOR HOT BLAST SLIDE Inventors: Johannes Uerlichs,Woffelsbach;

Rudolf Muller, Merzenich; Wilhelm Kuckertz, Konzendorf, all of GermanyHermann Rappold & C0. GmbI-I,

Duren, Germany May 9, 1972 App]. No; 251,709

Foreign Application Priority Data May 17, 1971 Germany 2124303References Cited UNITED STATES PATENTS 3,499,462 3/1970 Berczynski137/340 3,557,823 1/1971 Carr et a1 137/340 FOREIGN PATENTS ORAPPLICATIONS 212,607 8/1909 Germany 165/169 Primary Examiner-Albert W,Davis, Jr. Assistant ExaminerS, J. Richter Attorney, Agent, orFirmWenderoth, Lind & Ponack [57] ABSTRACT A slide for hot blast slidedampers having a pair of spiral volutes arranged in the shape of a flatdisc having an inlet connection and an outlet connection for a coolantat the edge thereof. One of the spiral volutes leads the coolant fromthe inlet connection to the center of the disc and into the other spiralvolute whereby the coolant is lead from the center of the disc to theoutlet connection. The volutes are separated from each other by wallsextending transverse to the major plane of the disc to form a coolingchannel. The volutes are separated by a single common wall extendingsubstantially perpendicular to the major plane of the disc and the crosssection of the cooling channel may be substantially quadrangular. Thevolutes are made from spirally interwound open sections welded together.

2 Claims, 4 Drawing Figures DAMPER SLIDE FOR HOT BLAST SLIDE DAMPERSBACKGROUND OF THE INVENTION This invention relates to a slide for hotblast slide dampers composed of volutes of spirally interwound sectionsforming a flat disc peripherally embraced by a ring which projects fromthe side faces of the disc, and which is provided with'entry and outletconnections for a coolant conducted through the channels formed by thevolutes to the center of the disc and then back 1 again.

For the purpose of satisfactorily conducting the coolant through theslides of hotblast slide dampers so that occlusions of air and thedeposition of sludge is avoided, it has been proposed in German Pat.Specification No. 1,031,329 to form the cooling channels This is a formof construction which provides excellent cooling effects with a minimumvolume of coolant. However, structurally the arrangement is not yetadequate, without considerable additional reinforcement, to withstandthe static loads that arise when the damper is closed at the hotblastpressures that are now conventional.

Additional reinforcement involves additional expense and an increase inthe thickness of the damper slide and this in turn adversely affects theoverall dimensions of the damper casing. These drawbacks are even morepronounced in the case of hot blast slide dampers in which the slidesare faced with refractory material to protect the metallic parts fromthe effects of direct thermal radiation.

SUMMARY OF THE INVENTION It is an object of the present invention withthe aid of simple structural devices to improve the resistance of thedamper slide to static loads. According to the present invention in aslide for hot blast slide dampers, which affords a cooling channel inthe form of a pair of spiral volutes arranged in the shape of a flatdisc, one of the spiral volutes leading coolant from an inlet connectionat the edge of the disc to the center of the disc and into the other ofthe spiral volutes, by which the coolant is then lead from the center ofthe disc to an outlet connection at the edge of the disc, the volutesare separated from each other by walls extending transverse to the majorplane of the disc. The volutes are preferably separated by a singlecommon wall extending substantially perpendicular to the major plane ofthe disc. The crosssection of the cooling channel is thus preferablysubstantially square or rectangular. The structure may be manufacturedin any desired manner but we have found that a method involving weldingopen channel section material is preferable. Thus the volutes arepreferably made from spirally interwound open sections welded together.

If the sections are suitably chosen the slide will be able to stand upto the loads which are imposed by the hot blast pressures and hot blasttemperatures that are now conventional, without the need of additionalstiffening means. The section moduli of channel sections far exceedthose of hollow section spirals of similar weight, bearing in mind thatthe flanges of channel sections can be made thicker and at the same timethe webs made thinner, since in the contemplated application the lattercontributes little to the strength of the structure. A slide accordingto the invention of the same stability and load-bearing ability as aconventional slide can be substantially thinner than the latter, acircumstance which has a favorable effect on the overall length of theslide damper assembly. At the same time the advantages achieved by usinghollow sections, such as simplicity of production, high water velocitiesand small water volumes, good self cleaning effect and the avoidance ofwater leakage from the high pressure spiral conducting the water inwardsinto the lower pressure spiral conducting the water outwards, are allfully preserved. Despite a reduced expenditure in structural means theinvention provides an efficient damper slide which satisfies thetechnical and service requirements.

If the spiral volutes used for the construction of the proposed slideare wound from a section offering considerable resistance to being bentto the required shape it is preferable to form the center of the spiralvolutes from a special core piece whichcontinues the coolingchannelsformed by the sections. This considerably facilitates theproduction of the slide.

For winding the spiral volutes conventional rolled steel sectionsforming a channel on one or both sides may be used. Particularlysuitable are I-sections which have been very successful in practice.

BRIEF DESCRIPTION OF THE-DRAWINGS With the above and other objects inview which will become apparent, one specific embodiment of the damperslide in accordance with the present invention will be shown by way ofexample with reference to the accompanying drawings in which:

FIG. 1 is a plan view of one face of a damper slide, a part of thecenter as well as a portion including the inlet and outlet connectionsfor the coolant being in section,

FIG. 2 is a part sectional side view of the slide according to FIG. 1,

FIG. 3 is a cross section on a larger scale of the core piece of thedamper slide, and

FIG. 4 is a fragmentary cross section of the slide, likewise on a largerscale.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawings, 1 and 2are two flat spiral volutes consisting of steel I-section channelmembers, the convolutions being radially spaced by the overall width bof the I-section flanges.

The two volutes l and 2 are interwound and their flange edges, which arebevelled for the formation of weld seams, are welded together to providea spiral pitch b.

This form of construction defines convoluted cooling channels 5 and 6between the webs 3 and 4 of consecutive convolutions of the two spiralvolutes, the two channels being connected in the center of the slide.One channel 5 serves for conducting the coolant to the slide center,whereas the other channel 6 conducts it back again to the outside.

For establishing communication between the channels 5 and 6 in thecenter of the slide a core piece 7 is provided which contains deflectingmeans 8 and 9 forming continuations of the webs 3 and 4 of the spirallyinterwound members 1 and 2 which are connected to the core piece 7 at 10and 11. V

The circumference of the slide is embraced by a hollow ring 12 providedwith sealing faces at 13 and 14 which cooperate with correspondingsealing faces in the damper casing when the slide damper is closed. Onits outer periphery the hollow ring 12 is provided with an entryconnection 15 and an outlet connection 16 for the coolant and it formsthe intermediate member between the connections 15 and 16 and thevolutes 1 and 2, the webs 3 and 4 of the sections merging at 17 and 18into the inner circumferential wall of the hollow ring 12.

As will be understood, more particularly by reference to FIG. 2, thewidth of the hollow ring 12 exceeds the width of the sections formingthe volutes 1 and 2 so that pan-shaped recesses 19 and 20 which remainon each face of the slide can be filled with a refractory material.

said pair of channel members being spirally interwound with the edges ofthe flanges of one of said members sealingly connected to the edges ofthe flanges of the other of said members;

said spirally interwound members forming a flat disc;

said connected and spirally interwound members forming therebetween apair of spaced convoluted cooling channels, said channels beingseparated by said webs of said members;

said channels being connected at the center of said flat disc;

a first of said channels, at the periphery of said disc, having an inletconnection for communication with a source of cooling fluid;

a second of said channels, at the periphery of said disc, having anoutlet connection for discharging said cooling fluid;

whereby cooling fluid flows into said first channel from said inletconnection, through said first channel to said center of said disc andinto said second channel, and through said second channel to said outletconnection; and

a core member positioned at said center of said disc, said core memberhaving deflecting means forming continuations of said webs of saidmembers.

2. A slide as claimed in claim 1, further comprising a hollow ringsurrounding the periphery of said disc, said hollow ring having sealingsurfaces for engagement with corresponding surfaces of said casing ofsaid slide damper.

1. A slide for use in a hot blast slide damper having a casing, saidslide comprising: a pair of channel members, each having an I-shapecross-section with opposite flanges joined by a web; said pair ofchannel members being spirally interwound with the edges of the flangesof one of said members sealingly connected to the edges of the flangesof the other of said members; said spirally interwound members forming aflat disc; said connected and spirally interwound members formingtherebetween a pair of spaced convoluted cooling channels, said channelsbeing separated by said webs of said members; said channels beingconnected at the center of said flat disc; a first of said channels, atthe periphery of said disc, having an inlet connection for communicationwith a source of cooling fluid; a second of said channels, at theperiphery of said disc, having an outlet connection for discharging saidcooling fluid; whereby cooling fluid flows into said first channel fromsaid inlet connection, through said first channel to said center of saiddisc and into said second channel, and through said second channel tosaid outlet connection; and a core member positioned at said center ofsaid disc, said core member having deflecting means formingcontinuations of said webs of said members.
 2. A slide as claimed inclaim 1, further comprising a hollow ring surrounding the periphery ofsaid disc, said hollow ring having sealing surfaces for engagement withcorresponding surfaces of said casing of said slide damper.